关键词: 冲击冷却;导流片;气热耦合;射流孔

Abstract: Methods of installing deflector in the blade and arranging jet holes are adopted for high temperature blades impinging cooling on account for the problem of the high surface temperature for a high-pressure turbine blade.Three-dimensional conjugate heat transfer methodology analysis is completed using Transition k-kl-ω model.Methods of improving the effect of impinging cooling are discussed in order to achieve the goal of enhancing the cooling effect and reducing the performance requirements for the material with the same amount of gas flow rate. The computational results show that if the number of holes and the diameter meet the relationship(4n-1)D=h, the temperature along blade height can satisfy the cooling requirements for certain conditions.Opening three jet holes in the pressure side and four in the suction side, cooling requirements of the leaves chord region can be satisfied, and the exhaust heat phenomenon of trailing edge can be eliminated using the way of splitting seam.The inner and outer average temperature of blade surfaces almost keep the same when the distance of deflector and the blade z_n/D changes between 1.71~2.57.However, with smaller spacing, the maximum temperature will fall and the minimum temperature will rise.The cooling effects will be better with lower cooling gas temperature or higher mass flow rate. 

Key words: Impinging cooling；Deflector；Conjugate heat transfer methodology；Impinging hole